LAWSON: KANSAS CICADELLID.^. 167 



plates broad, divergent, outer margin concave, inner margin broadly 

 rounding to meet outer margin in obtuse apex; pygofers slightly ex- 

 ceeding plates, covered with short bristles. 



Distrihution: Taken in Pottawatomie county only. 

 Hosts: Doctor Ball informs me that GrindeUa is the host 

 plant of this species. 



Genus Euscelis Brul. 



The members of this genus are generally robust with the 

 head slightly wider than the pronotum. The vertex may be 

 distinctly angulate. The pronotum is rather short. The elytra 

 are long in the forms with a transverse vertex, but usually 

 short in the others. The ovipositor is rather uniformly short, 

 thus distinguishing it from some nearly related genera. The 

 genus is distinctly lacking in positive characters. 



Twelve species of this genus have been reported from Kan- 

 sas and are keyed below. 



KEY TO SPECIES.* 



A. Vertex transverse, much wider than long, margins nearly or quite 

 parallel, anterior margin obtusely rounding to front. 



B. Size very large, 7 mm. or over. magnus. 



BB. Size smaller, 6 mm. or less. 



C. Ground color white, not greenish, margin of vertex with 

 black spots. exitiosus. 



CC. Ground color green, vertex with transverse bands. 



D. Vertex slightly longer on middle than against eye, 

 transverse band on vertex narrow and straight. 



striohis. 

 DD. Margins of vertex strictly parallel; transverse 

 band on vertex broader, parallel with the margins. 



parallelus. 

 AA. Vertex not distinctly transverse, usually pi-oduced and angulate; an- 

 terior margin meeting front at an angle. 

 B. Vertex distinctly wider than its middle length. 



C. Markings of vertex in form of transverse lines or absent. 

 D. Species stout, elytra shorter than or only slightly 

 exceeding abdomen, central anteapical cell rarefy 

 constricted. 



E. Straw-colored species. extrusus. 



EE. Black species. 



F. Vertex distinctly angular, nearly twice 

 as long on middle as against eye; a yel- 

 low band at base of vertex and usually 

 the nervures yellow. uhleri. 



FF. Vertex rounding, but little longer on 

 middle than at eye. anthracinus. 



* Adapted from key by Osborn & Ball. Ohio Nat., ii. pp. 231-257. 1902. 



